"The Secret of Moonacre" is a fantasy film based on the novel "The Little White Horse" by Elizabeth Goudge. The story follows a young girl named Maria Merryweather, who moves to her late father's ancestral home, Moonacre Manor, after his death. There, she discovers a magical world filled with secrets, including a long-standing feud between two families and the mystical creatures that inhabit the land. As Maria uncovers the truth about her family's past, she learns about the importance of love, friendship, and bravery. With the help of her new friends, including Robin, she embarks on a quest to restore harmony to the enchanted land and protect its magic from dark forces.